| 摘要 |
A vacuum-operated brake power booster, provided with a control valve comprising a control valve piston with its valve body actuated by a piston rod and having a poppet valve with two valve seat faces and a valve seat at the longitudinally slidable control valve body. The movements of the poppet valve relative to the two valve seats are controlled by a transverse member whose radially external end touches against a stationary sealing ring of the housing of the booster in the release position of the brake. For the interaction of the poppet valve with the transverse member, the liner of the poppet valve is furnished with at least one opening whose width is larger than the thickness of the transverse member which engages in that groove. Due to the transverse member touching the stationary sealing ring, the lost motion of the valve is reducible to zero. |
